I had mice eat the plastic insulation off the fuel injection harness under my hood I hung a small fine mesh produce bag with a few mothballs near the wires (seems to work so far)I keep watching for any new signs of nesting material in the area.It would have been a costly repair but I was able to...
A bit off topic but if you have any to discard and have a VA Medical Ctr near by think about dropping them off as a donation.i know the one near me is always in need of reading material.